The virus that causes a deadly new respiratory disease known as Middle East respiratory syndrome, or MERS, has been found in a bat in Saudi Arabia. The finding suggests that animals may transfer the virus to humans.

The disease was first diagnosed in a Saudi Arabian man last September. Since then, 99 people have gotten sick from the virus and 48 of them died. Scientists know that the coronavirus that causes the disease is related to the one that causes severe acute respiratory syndrome, or SAR...